> union {
>   intersection {
>     cylinder { horizontal }
>     plane { diagonal, interior up }
>   }
>   intersection {
>     cylinder { vertical }
>     plane { diagonal, interior down }
>   }
> }
>
> But it leads to coincident surfaces.

But those coincident surfaces are on the *inside*, which shouldn't be a
problem... or do you need this to be transparent?

If so, making the cylinders overlap should still be an option - just do it
only a tiny, tiny bit, so that you can't see it at any reasonable resolution
but the coincident surface is elliminated.

 - Slime
 [ http://www.slimeland.com/ ]

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